OEM Navigation system installation hel[

I have installed a oem navigation system out of an 03' Expedition into my 02' E-350, along with the nav unit I have installed a DVD player and ricp out of an 04' Navigator. Everything works as it should except for the nav unit. My problem I believe is in the one wire that feeds the vehicle speed info into the unit. I am unsure where this should be tapped into, I have tried the the LF wheel speed sensor, the rear end speed sensor, and the trans speed sensor, all to no avail. I even tried a abs module out of a navigator, bootlegged it up with as few wires possible, and still, the nav unit does not show me moving. Any suggestions would be greatly appreciated!!! Thanks...

gunkel,

Did you get this to work? I am trying to do a nearly identical project. I am going from an '03 Expedition to an '04. Can you tell me what you did to make your's work?
I just bought the head unit and would really like to know what it takes to do this mod, as I have time to back out of the deal.

Thanks...

There should be a VSS (Vehicle Speed Sensor) lead that goes into the EEC.

That's where you're supposed to tap the Speed pulse wire.
Tapping it on the wheel speed sensor won't work.

I don't know what the lead number that is, but it should be easy enough to find in publications like Helms.

I too would like to know how you wired the Nav unit.
I have an '03 Expy and I got the Nav unit off of e-bay and I have yet to figure out how to wire it in. I need the pin out of the unit and the plugs to go into the unit.
I added the OEM DVD unit allready, my expy didn't come with it, I got it off of e-bay $150.00 and did a lot of research to figure out how to wire it in but I did it and the kids love.
Now if I can get a little help with the Nav unit my life will be complete. :iceslolan

I think the wire you are looking for is the VSS (vehicle speed sensor) wire.
I have seen this on some post about this "I THINK" it is a grey wire with black stripe. But don't quote me on that.

Tim